<template>
  <!-- 滑动验证 -->
  <!-- <div>{{msg}}</div> -->
  <div class="drag" ref="dragDiv">
    <div class="drag_bg"></div>
    <div class="drag_text">{{ confirmWords }}</div>
    <div ref="moveDiv" @mousedown="mousedownFn($event)" :class="{ 'handler_ok_bg': confirmSuccess }"
      class="handler handler_bg" style="position: absolute;top: -5px;left: -2px;"></div>
  </div>
</template>

<script>
export default {
  name: 'Loading',
  data() {
    return {
      beginClientX: 0,           /*距离屏幕左端距离*/
      mouseMoveStata: false,     /*触发拖动状态  判断*/
      maxwidth: '',               /*拖动最大宽度，依据滑块宽度算出来的*/
      // confirmWords:'拖动滑块验证',   /*滑块文字*/
      confirmWords: '拖动滑块验证',
      confirmSuccess: false           /*验证成功判断*/
    }
  },
  methods: {
    //mousedoen 事件
    mousedownFn: function (e) {
      if (!this.confirmSuccess) {
        e.preventDefault && e.preventDefault();   //阻止文字选中等 浏览器默认事件
        this.mouseMoveStata = true;
        this.beginClientX = e.clientX;
      }
    },
    //验证成功函数
    successFunction() {
      this.confirmSuccess = true
      this.confirmWords = '验证成功'
      //销毁监听
      if (window.addEventListener) {
        document.getElementsByTagName('html')[0].removeEventListener('mousemove', this.mouseMoveFn);
        document.getElementsByTagName('html')[0].removeEventListener('mouseup', this.moseUpFn);
      } else {
        document.getElementsByTagName('html')[0].removeEventListener('mouseup', () => { });
      }
      //滚动条满
      document.getElementsByClassName('drag_text')[0].style.color = '#fff'
      document.getElementsByClassName('handler')[0].style.left = this.maxwidth + 'px';
      document.getElementsByClassName('drag_bg')[0].style.width = this.maxwidth + 51 + 'px';

    },
    //mousemove事件               
    mouseMoveFn(e) {
      if (this.mouseMoveStata) {
        let width = e.clientX - this.beginClientX;
        if (width > 0 && width <= this.maxwidth) {
          document.getElementsByClassName('handler')[0].style.left = width + 'px';
          document.getElementsByClassName('drag_bg')[0].style.width = width + 51 + 'px';
        } else if (width > this.maxwidth) {
          this.successFunction();
        }
      }
    },
    //mouseup事件               
    moseUpFn(e) {
      this.mouseMoveStata = false;
      var width = e.clientX - this.beginClientX;
      //滚动条恢复0
      if (width < this.maxwidth) {
        document.getElementsByClassName('handler')[0].style.left = 0 + 'px';
        document.getElementsByClassName('drag_bg')[0].style.width = 0 + 51 + 'px';
      }
    }
  },
  mounted() {
    this.maxwidth = this.$refs.dragDiv.clientWidth - this.$refs.moveDiv.clientWidth;
    //创建监听
    document.getElementsByTagName('html')[0].addEventListener('mousemove', this.mouseMoveFn);
    document.getElementsByTagName('html')[0].addEventListener('mouseup', this.moseUpFn)
  },
  beforeDestroy() {
    //销毁监听
    document.getElementsByTagName('html')[0].removeEventListener('mousemove', this.mouseMoveFn);
    document.getElementsByTagName('html')[0].removeEventListener('mouseup', this.moseUpFn);
  },

}


</script>

<style scoped>
.drag {
  position: relative;
  background-color: #e8e8e8;
  width: 100%;
  height: 40px;
  line-height: 40px;
  text-align: center;
  border-radius: 20px;
}

.handler {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  /* background: url('../../assets/img/drag.png') center no-repeat; */
  background-size: cover;
  /* border: 1px solid #ccc; */
  cursor: move;
}

.handler_bg {
  background: url('@/assets/img/drag_ok.png') center no-repeat;
  background-size: cover;
}

.handler_ok_bg {
  background: url("@/assets/img/drag.png") no-repeat center;
  background-size: cover;
  margin-left: 6px;
}

.drag_bg {
  background-color: rgb(250, 202, 98);
  height: 40px;
  width: 0px;
  border-radius: 20px;
}

.drag_text {
  position: absolute;
  top: 0px;
  width: 100%;
  text-align: center;
  -moz-user-select: none;
  -webkit-user-select: none;
  user-select: none;
  -o-user-select: none;
  -ms-user-select: none;
}
</style>